When you are looking into the open bobbin case, the bobbin should be placed in there with the thread tail on the right side. (When pulled it would come off the bobbin counterclockwise). Then you thread it "backwards" through the slot in the bobbin case. Hope that makes sense. Also, make sure the thread tail is long enough. If it is too short, it gets picked up, and then falls out before it gets up through the hole in the needle plate. That's all I know............